Apex PA85, PA85A Datasheet

HIGH VOLTAGE POWER OPERATIONAL AMPLIFIERS

MICROTECHNOLOGY

HTTP://WWW.APEXMICROTECH.COM (800) 546-APEX [phone]

FEA TURES

• HIGH VOLTAGE — 450V (±225V)

• HIGH SLEW RATE — 1000V/µS

• HIGH OUTPUT CURRENT — 200mA

APPLICATIONS

• HIGH VOLTAGE INSTRUMENTATION

• PIEZO TRANSDUCER EXCITATION

• PROGRAMMABLE POWER SUPPLIES UP TO 430V

• ELECTROSTATIC TRANSDUCERS & DEFLECTION

DESCRIPTION

The PA85 is a high voltage, high power bandwidth MOSFET
operational amplifier designed for output currents up to 200mA.
Output voltages can swing up to ±215V with a dual supply and
up to +440 volts with a single supply. The safe operating area
(SOA) has no second breakdown limitations and can be
observed with all types of loads by choosing an appropriate
current limiting resistor. High accuracy is achieved with a
cascode input circuit configuration. All internal biasing is
referenced to a bootstrapped zener-MOSFET current source.
As a result, the PA85 features an unprecedented supply range
and excellent supply rejection. The MOSFET output stage is
biased on for linear operation. External compensation pro­vides user flexibility.

This hybrid circuit utilizes thick film (cermet) resistors, ce­ramic capacitors and silicon semiconductor chips to maximize
reliability, minimize size and give top performance. Ultrasoni­cally bonded aluminum wires provide reliable interconnec­tions at all operating temperatures. The 8-pin TO-3 package is
hermetically sealed and electrically isolated. The use of com­pressible isolation washers voids the warranty.

EQUIVALENT SCHEMATIC

D1

Q10B

Q4

45

D2

D23

COMP

87

Q11

Q8

Q16

Q9

Q12

Q17

Q1 Q2

Q6 Q7

–IN +IN

Q10A

Q13

PA85 • PA85A

TYPICAL APPLICATION

Dynamic focusing is the active correction of focusing volt­age as a beam traverses the face of a CRT. This is necessary
in high resolution flat face monitors since the distance be­tween cathode and screen varies as the beam moves from the
center of the screen to the edges. PA85 lends itself well to this
function since it can be connected as a summing amplifier with
inputs from the nominal focus potential and the dynamic
correction. The nominal might be derived from a potentiom­eter, or perhaps automatic focusing circuitry might be used to
generate this potential. The dynamic correction is generated
from the sweep voltages by calculating the distance of the
beam from the center of the display.

DC

FOCUS

X SWEEP

SAMPLE

2

CL

3

TOP VIEW

6

COMP

2

2

Q18

z = x + y

Y SWEEP

SAMPLE

3

EXTERNAL CONNECTIONS

+V

S

+Vs

C

L

2

+IN

4

1

OUT

–V

6

S

–IN

5

–Vs

PATENTED

R

IN1

R

IN2

R

CL

1

OUT

COMP

8

7

R

C

R

F

+225V

PA85

–225V

R

CL

PHASE COMPENSATION

Gain C

1 68pF 100Ω

20 10pF 330Ω

100 3.3pF 0Ω

CC RATED FOR FULL

SUPPLY VOLTAGE

C

C

TO
FOCUS
GRID

C

R

C

APEX MICROTECHNOLOGY CORPORATION • TELEPHONE [phone] • FAX [phone] • ORDERS [phone] • EMAIL [e-mail]

P A85 • P A85A

ABSOLUTE MAXIMUM RATINGS

SPECIFICATIONS

ABSOLUTE MAXIMUM RATINGS

SUPPLY VOLTAGE, +VS to –V
OUTPUT CURRENT, continuous within SOA 200mA

S

450V

POWER DISSIPATION, continuous @ TC = 25°C230W
INPUT VOLTAGE, differential ±25V
INPUT VOLTAGE, common mode ±V
TEMPERATURE, pin solder - 10s max 300°C
TEMPERATURE, junction

2

S

150°C
TEMPERATURE, storage –65 to +150°C
OPERATING TEMPERATURE RANGE, case –55 to +125°C

SPECIFICATIONS

PARAMETER TEST CONDITIONS

PA85

1

MIN TYP MAX MIN TYP MAX UNITS

PA85A

INPUT

OFFSET VOLTAGE, initial .5 2 .25 .5 mV
OFFSET VOLTAGE, vs. temperature Full temperature range 10 30 5 10 µV/°C
OFFSET VOLTAGE, vs. supply 3 10 * * µV/V
OFFSET VOLTAGE, vs. time 75 * µV/√kh
BIAS CURRENT, initial
BIAS CURRENT, vs. supply .01 * pA/V
OFFSET CURRENT, initial
INPUT IMPEDANCE, DC 10
INPUT CAPACITANCE 4 * pF
COMMON MODE VOLTAGE RANGE

3

3

4

±VS–12 * V

550 310pA

10 100 3 30 pA

11

* Ω

COMMON MODE REJECTION, DC VCM = ±90V 90 110 * * dB
NOISE 100kHz BW, RS = 1KΩ, CC = 10pf 1 * µVrms

GAIN

OPEN LOOP, @ 15Hz RL = 2KΩ, CC = OPEN 96 111 * * dB
GAIN BANDWIDTH PRODUCT at 1MHz RL = 2KΩ, CC = 3.3pf 100 * MHz
POWER BANDWIDTH CC = 10pf 300 * kHz

CC = 3.3pf 500 * kHz

PHASE MARGIN Full temperature range 60 * °

OUTPUT

VOLTAGE SWING
VOLTAGE SWING
VOLTAGE SWING

4
4
4

IO = ±200mA ±Vs–10 ±Vs–6.5 * * V
IO = ±75mA ±V–8.5 ±Vs–6.0 * * V

IO = ±20mA ±V–8.0 ±Vs–5.5 * * V
CURRENT, continuous TC = 85°C ±200 * mA
SLEW RATE, AV = 20 CC = 10pf 400 * V/µs
SLEW RATE, AV = 100 CC = OPEN 1000 700 * V/µs
CAPACITIVE LOAD, AV = +1 Full temperature range 470 * * pf
SETTLING TIME to .1% CC = 10pf, 2V step 1 * µs
RESISTANCE, no load RCL = 0 50 * Ω

POWER SUPPLY

VOLTAGE

6

Full temperature range ±15 ±150 ±225 * * * V
CURRENT, quiescent 21 25 * * mA

THERMAL

RESISTANCE, AC, junction to case

5

Full temperature range, F > 60Hz 2.5 * °C/W
RESISTANCE, DC, junction to case Full temperature range, F < 60Hz 4.2 * °C/W
RESISTANCE, junction to air Full temperature range 30 * °C/W
TEMPERATURE RANGE, case Meets full range specifications –25 +85 * * °C

NOTES: * The specification of PA85A is identical to the specification for PA85 in applicable column to the left.

1. Unless otherwise noted: TC = 25°C, compensation = CC = 68pF, RC = 100Ω. DC input specifications are ± value given. Power
supply voltage is typical rating.

2. Long term operation at the maximum junction temperature will result in reduced product life. Derate internal power dissipation
to achieve high MTTF. Ratings apply only to output transistors. An additional 10W may be dissipated due to quiescent power.

3. Doubles for every 10°C of temperature increase.

4. +VS and –VS denote the positive and negative power supply rail respectively.

5. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz.

6. Derate max supply rating .625 V/°C below 25°C case. No derating needed above 25°C case.

CAUTION

The PA85 is constructed from MOSFET transistors. ESD handling procedures must be observed.
The internal substrate contains beryllia (BeO). Do not break the seal. If accidentally broken, do not crush, machine, or

subject to temperatures in excess of 850°C to avoid generating toxic fumes.

APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: [phone]